4 <title>vorbisfile - Example Code</title>
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11 <td><p class=tiny>Vorbisfile documentation</p></td>
12 <td align=right><p class=tiny>vorbisfile version 1.2.0 - 20070723</p></td>
16 <h1>Example Code: seeking</h1>
19 The following is a run-through of the seeking example program supplied
20 with vorbisfile - <a href="seeking_test_c.html">seeking_test.c</a>.
21 This program tests the vorbisfile <a href="ov_time_seek.html">ov_time_seek</a> function by seeking to random points within the file.
24 First, relevant headers, including vorbis-specific "codec.h" and "vorbisfile.h" have to be included.
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31 #include <stdlib.h>
33 #include "vorbis/codec.h"
34 #include "vorbis/vorbisfile.h"
40 <p>Inside main(), we declare our primary OggVorbis_File structure. We also declare other helpful variables to track our progress within the file.
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54 <p>This example takes its input on stdin which is in 'text' mode by default under Windows; this will corrupt the input data unless set to binary mode. This applies only to Windows.
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60 #ifdef _WIN32 /* We need to set stdin to binary mode under Windows */
61 _setmode( _fileno( stdin ), _O_BINARY );
68 <p><a href="ov_open_callbacks.html">ov_open()</a> must be
69 called to initialize the <a href="OggVorbis_File.html">OggVorbis_File</a> structure with default values.
70 <a href="ov_open_callbacks.html">ov_open_callbacks()</a> also checks to ensure that we're reading Vorbis format and not something else.
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77 if(ov_open_callbacks(stdin,&ov,NULL,-1, OV_CALLBACKS_NOCLOSE)<0){
78 printf("Could not open input as an OggVorbis file.\n\n");
88 First we check to make sure the stream is seekable using <a href="ov_seekable.html">ov_seekable</a>.
90 <p>Then we seek to 100 random spots in the bitstream using <a href="ov_time_seek.html">ov_time_seek</a> with randomly generated values.
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98 /* print details about each logical bitstream in the input */
100 double length=ov_time_total(&ov,-1);
101 printf("testing seeking to random places in %g seconds....\n",length);
103 double val=(double)rand()/RAND_MAX*length;
104 ov_time_seek(&ov,val);
105 printf("\r\t%d [%gs]... ",i,val);
109 printf("\r \nOK.\n\n");
111 printf("Standard input was not seekable.\n");
119 When we're done seeking, we need to call <a href="ov_clear.html">ov_clear()</a> to release the bitstream.
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135 The full source for seeking_test.c can be found with the vorbis
136 distribution in <a href="seeking_test_c.html">seeking_test.c</a>.
140 <table border=0 width=100%>
142 <td><p class=tiny>copyright © 2007 Xiph.org</p></td>
143 <td align=right><p class=tiny><a href="http://www.xiph.org/ogg/vorbis/">Ogg Vorbis</a><br><a href="mailto:team@vorbis.org">team@vorbis.org</a></p></td>
145 <td><p class=tiny>Vorbisfile documentation</p></td>
146 <td align=right><p class=tiny>vorbisfile version 1.2.0 - 20070723</p></td>